package com.xjggb.dateapi;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAdjusters;
import java.util.Date;

public class Demo01 {
    public static void main(String[] args) {
        /*
        * 
        * - LocalDate ：表示日期，包含年月日，格式为 2019-10-16
           - LocalTime ：表示时间，包含时分秒，格式为 16:38:54.158549300
           - LocalDateTime ：表示日期时间，包含年月日，时分秒，格式为 2018-09-06T15:33:56.750
           - DateTimeFormatter ：日期时间格式化类。
           - Instant：时间戳，表示一个特定的时间瞬间。
           - Duration：用于计算2个时间(LocalTime，时分秒)的距离
           - Period：用于计算2个日期(LocalDate，年月日)的距离
           - ZonedDateTime ：包含时区的时间*/
        show11();

    }

    /**
     * 时区操作
     */
    public static void show11(){
        // 1.获取所有的时区id
        // ZoneId.getAvailableZoneIds().forEach(System.out::println);

        // 获取当前时间 中国使用的 东八区的时区，比标准时间早8个小时
        LocalDateTime now = LocalDateTime.now();
        System.out.println("now = " + now); // 2021-05-27T17:17:06.951
        // 获取标准时间
        ZonedDateTime bz = ZonedDateTime.now(Clock.systemUTC());
        System.out.println("bz = " + bz); // 2021-05-27T09:17:06.952Z

        // 使用计算机默认的时区，创建日期时间
        ZonedDateTime now1 = ZonedDateTime.now();
        System.out.println("now1 = " + now1); //2021-05-27T17:17:06.952+08:00[Asia/Shanghai]

        // 使用指定的时区创建日期时间
        ZonedDateTime now2 = ZonedDateTime.now(ZoneId.of("America/Marigot"));
        System.out.println("now2 = " + now2);
    }

    /*
    *
    * 时间矫正器
    * */
    public static void show10(){

        LocalDateTime now = LocalDateTime.now();
        // 将当前的日期调整到下个月的一号
        TemporalAdjuster adJuster = (temporal)->{
            LocalDateTime dateTime = (LocalDateTime) temporal;
            LocalDateTime nextMonth = dateTime.plusMonths(1).withDayOfMonth(1);
            System.out.println("nextMonth = " + nextMonth);
            return nextMonth;
        };
        // 我们可以通过TemporalAdjusters 来实现
        // LocalDateTime nextMonth = now.with(adJuster);
        LocalDateTime nextMonth = now.with(TemporalAdjusters.firstDayOfNextMonth());
        System.out.println("nextMonth = " + nextMonth);
    }

    /*
     * 计算时间差
     * */
    public static void show9() {
        // 计算时间差
        LocalTime now = LocalTime.now();
        LocalTime time = LocalTime.of(22, 48, 59);
        System.out.println("now = " + now);
        // 通过Duration来计算时间差
        Duration duration = Duration.between(now, time);
        System.out.println(duration.toDays()); // 0
        System.out.println(duration.toHours()); // 6
        System.out.println(duration.toMinutes()); // 368
        System.out.println(duration.toMillis()); // 22124240

        // 计算日期差
        LocalDate nowDate = LocalDate.now();
        LocalDate date = LocalDate.of(1997, 12, 5);
        Period period = Period.between(date, nowDate);
        System.out.println(period.getYears()); // 23
        System.out.println(period.getMonths()); // 5
        System.out.println(period.getDays()); // 22
    }


    /**
     * Instant 时间戳
     * 可以用来统计时间消耗
     */
    public static void show8() {
        try {
            Instant now = Instant.now();
            System.out.println("now = " + now);

            // 获取从1970年一月一日 00:00:00 到现在的 纳秒
            System.out.println(now.getNano());

            Thread.sleep(5);
            Instant now1 = Instant.now();
            System.out.println("耗时：" + (now1.getNano() - now.getNano()));
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }

    /*
     * 日期格式化
     * */

    public static void show7() {
        LocalDateTime now = LocalDateTime.now();
        DateTimeFormatter isoLocalDateTime = DateTimeFormatter.ISO_LOCAL_DATE_TIME;

        //将日期转换成字符串
        String format = now.format(isoLocalDateTime);
        System.out.println("format = " + format);
        /*
         * 指定特殊格式
         * */
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String format1 = now.format(dateTimeFormatter);
        System.out.println("format1 = " + format1);

        /*
         * 字符串解析一个日期类型
         * */

        LocalDateTime parse = LocalDateTime.parse("1997-05-06 22:45:16", dateTimeFormatter);
        System.out.println("parse = " + parse);

    }


    /**
     * 日期时间的比较
     */

    public static void show6() {
        LocalDate now = LocalDate.now();
        LocalDate date = LocalDate.of(2020, 1, 3);
        // 在JDK8中要实现 日期的比较 isAfter  isBefore isEqual 通过这几个方法来直接比较
        System.out.println(now.isAfter(date)); // true
        System.out.println(now.isBefore(date)); // false
        System.out.println(now.isEqual(date)); // false
    }


    /*
     * 时间日期的修改
     * */

    public static void show5() {
        LocalDateTime now = LocalDateTime.now();
        System.out.println("now = " + now);
        // 修改日期时间  对日期时间的修改，对已存在的LocalDate对象，创建了它模板
        // 并不会修改原来的信息
        LocalDateTime localDateTime = now.withYear(1998);
        System.out.println("now :" + now);
        System.out.println("修改后的：" + localDateTime);

        System.out.println("月份：" + now.withMonth(10));
        System.out.println("天：" + now.withDayOfMonth(6));
        System.out.println("小时：" + now.withHour(8));
        System.out.println("分钟:" + now.withMinute(15));

        // 在当前日期时间的基础上 加上或者减去指定的时间
        System.out.println("两天后:" + now.plusDays(2));
        System.out.println("10年后:" + now.plusYears(10));
        System.out.println("6个月后 = " + now.plusMonths(6));

        System.out.println("10年前 = " + now.minusYears(10));
        System.out.println("半年前 = " + now.minusMonths(6));
        System.out.println("一周前 = " + now.minusDays(7));
    }


    /*
     * 时间日期类型
     * */

    public static void show4() {
        // 获取指定的日期时间
        LocalDateTime dateTime =
                LocalDateTime.of(2020
                        , 06
                        , 01
                        , 12
                        , 12
                        , 33
                        , 213);

        System.out.println(dateTime);
        // 获取当前的日期时间
        LocalDateTime now = LocalDateTime.now();
        System.out.println(now);
        // 获取日期时间信息
        System.out.println(now.getYear());
        System.out.println(now.getMonth().getValue());
        System.out.println(now.getDayOfMonth());
        System.out.println(now.getDayOfWeek().getValue());
        System.out.println(now.getHour());
        System.out.println(now.getMinute());
        System.out.println(now.getSecond());
        System.out.println(now.getNano());


    }


    /*
     * 时间操作
     * */
    public static void show3() {
        LocalTime of = LocalTime.of(5, 26, 33, 15546);
        System.out.println("of = " + of);

        //获取当前时间

        LocalTime now = LocalTime.now();
        System.out.println("now = " + now);
        // 3.获取时间信息
        System.out.println(now.getHour());
        System.out.println(now.getMinute());
        System.out.println(now.getSecond());
        System.out.println(now.getNano());

    }

    public static void show2() {
        //創建指定日期
        LocalDate of = LocalDate.of(2021, 5, 9);
        System.out.println("of = " + of);

        //获得当前日期
        LocalDate now = LocalDate.now();
        System.out.println("now = " + now);

        //根据Loacldate获取对应的时期信息
        System.out.println("年 = " + now.getYear());
        System.out.println("月= " + now.getMonth().getValue());
        System.out.println("日= " + now.getDayOfMonth());
        System.out.println("星期" + now.getDayOfWeek().getValue());


    }


    public static void show1() {
        // 1.设计不合理
        Date date = new Date(2021, 05, 05);
        System.out.println(date);

        // 2.时间格式化和解析操作是线程不安全的
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        for (int i = 0; i < 50; i++) {
            new Thread(() -> {
                // System.out.println(sdf.format(date));
                try {
                    System.out.println(sdf.parse("2021-05-06"));
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }).start();
        }
    }

}
